* {
	marine:0px;
}
#container {
	background-color: black;
	width: 70%;
	height: 750px;
	marine:0px;
}
#div1 {
	background-color: fuchsia;
	width: 100%;
	height: 250px;
	/*margin: auto; *//*水平自适应对齐*/
	/*通过margin属性调整左右对齐*/
	margin:left;
}

#div2 {
	background-color: gray;
	width: 70%;
	height: 250px;
	/*通过position属性调整左右对齐*/
	position: absolute;
	left:0px;
}
#div3 {
	background-color: pink;
	width: 100%;
	height: 250px;
	/*通过float属性调整左右对齐*/
	float:left;
}